hi , have u tried the /etc/securetty file?
/etc/securetty file is used to restrict the terminals from where root user can logon. You can restrict telnet from certain hosts/ips but not a selected list/group of users really.
Perhaps he might have meant /etc/security/access.conf. which is honoured by pam moodule pam_access. Using this we can do user based and hostbased access control if the application is compiled with pam or if the application itself honours this file.
Another way is to use tcpwrappers access control if the application is compiled with this support. In this service and hostbased acess control may be done.
-logu
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